User:Jonas
From Lazarus wiki
Apple gcc Objective-C code
gcc/objc/objc-act.c
- generate_protocols(): create meta-class info for referenced protocols
- encode_method_prototype(): toplevel function to create the parameter info ("i8@0:4\0" etc, objc_meth_var_types section)
- finish_objc(): generate all class metadata (rtti)
LLVM Clang Objective-C code
http://llvm.org/svn/llvm-project/cfe/trunk/lib/CodeGen/CGObjCMac.cpp